HomeMy WebLinkAbout260.10PLANTING NOTES:
1.REFER TO THE RAIN GARDEN HANDBOOK FOR WESTERN WASHINGTON
FOR GUIDANCE ON PLANT SELECTION SITING AND SPACING BY ZONE.
2.PLANTS MUST BE PERENNIAL AND ADAPTED TO THE CONDITIONS
ENCOUNTERED IN ITS ZONE IN THE RAIN GARDEN. SEE PLANTING ZONE
TABLE.
3.EVERGREEN AND DECIDUOUS VEGETATION MAY BE USED BUT THE
MAJORITY OF MATERIAL MUST PROVIDE A SIGNIFICANT ABOVE GROUND
PRESENCE YEAR ROUND.
4.PLANTING DESIGN SHOULD MINIMIZE COMPACTION OF SOIL THROUGH
PLANNED MAINTENANCE ACCESS. ANNUAL PLANTS REQUIRING SOIL
DISTURBANCE FOR HARVESTING (E.G., CARROTS) OR ANNUAL
REPLANTING ARE NOT PERMITTED.
SCALE:
SECTION - RAIN GARDEN A
260.00NTS
EXISTING
GROUND
PIPED
CONNECTION
(OPTIONAL)
2" MIN. WASHED ROUND ROCK.
EXTEND TO 12" BEYOND
BOTTOM OF RAIN GARDEN
MIN. EXCAVATION EXTENT
COMPOST AMENDED SOILS PER STD. PLAN 264.00 OR
BIORETENTION SOIL MIX PER STD. PLAN 262.60
MULCH 3" DEPTH, SEE NOTE 2
2.5 MIN.
1
2.5 MIN.
1
12" MIN.
6" PONDING
6" MIN.
FREEBOARD
1% MIN., 4% MAX. SLOPE
6"
MIN.NON-WOVEN GEOTEXTILE FOR SEPARATION
PER WSDOT SPECIFICATIONS GEOTEXTILE
FOR SEPARATION SECTION 9-33.2(1) TABLE 3
3/4" - 1-1/2" WASHED DRAIN ROCK
6" MIN.
1"
4' MIN.
DISPERSION
TRENCH (TYP.)
BOTTOM WIDTH
18" MIN.
3 2 1 2 3
PLANTING ZONES,
SEE PLANTING NOTES AND PLANTING ZONES TABLE
NOTES:
1.RAISED BERM SHALL BE FIRM, UNDISTURBED, NON-YIELDING NATIVE SOIL OR
DISTURBED SITE SOILS COMPACTED WITH 12 POUND HAND TAMPER IN 3-INCH
LIFTS. IF SITE SOILS ARE SANDY, CONSIDER IMPORTING DENSER, NON-PERMISSIVE
SOILS FOR RAISED BERM. TOP WIDTH SHALL BE 6-INCHES MIN.
2.WOODY MULCH PREFERRED, ROCK MULCH OR BARK CHIP MULCH NOT PERMITTED.
SEE STD. PLAN 262.60 FOR ARBORIST WOOD CHIP MULCH.
3.OVERFLOW TO BE PIPED TO STORM DRAIN SYSTEM PER STD. PLAN 260.00 UNLESS
SURFACE OVERFLOW CAN BE DIRECTED TO A SUITABLE LOCATION AS APPROVED
BY THE CITY.
TABLE: PLANTING ZONES
ZONE PLANT TYPE LOCATION
1 EMERGENTS, PERENNIALS & LOW SHRUBS
(PLANTS THAT CAN TOLERATE STANDING WATER)FACILITY BOTTOM
2 EMERGENTS, PERENNIALS & LOW SHRUBS
(PLANTS THAT CAN TOLERATE OCCASIONAL STANDING WATER)LOWER SLOPE TO TOP OF PONDING
3 GROUNDCOVERS / SHRUBS UPPER SLOPE / SURFACE GRADE
ACCENT SHRUB
(SELECT APPROPRIATE SHRUB BASED ON ZONE)SURFACE GRADE / LOWER SLOPE / FACILITY BOTTOM
TREE CENTER WITHIN UPPER SLOPE. CONSIDER CANOPY OF FULL-GROWN TREE.
ALLOW CLEARANCE FOR WALKWAYS.
1
2
3
1 2 3
3
2' MIN.
OPTIONAL COMPACTED
EARTH BERM, SEE NOTE 1
2" MIN. WASHED
ROUND ROCK
GENERAL NOTES:
1.UNDERDRAINS ARE NOT ALLOWED WITHIN RAIN GARDENS.
2.SEE CONSTRUCTION PLANS FOR SPECIFIC PROJECT REQUIREMENTS.
OPTIONAL SURFACE
OVERFLOW, SEE NOTE 3
6" BIRD CAGE OVERFLOW, NDS 80 OR
EQUAL. SET RIM AT TOP OF PONDING
AND FASTEN TO DRAIN PIPE
45° ELBOW (TYP.)
PUBLIC WORKS
DEPARTMENT
APPROVED:
DATEGregg Zimmerman
Public Works Administrator
UNLESS OTHERWISE NOTED, DRAWING IS NOT TO SCALE (NTS)
RAIN GARDEN SECTION
STD. PLAN - 260.10
DocuSign Envelope ID: 6EECF5B6-602A-4E4A-B436-A317AA638878
9/28/2018 | 9:45 AM PDT